Sorry if this was discussed before, but any reason this is being put in Wayland, and in the "wl_" namespace? DMA-BUF is a private Linux kernel feature that's really semi-stable, not used by all drivers, and I'd hate for it to bit-rot and tell people not to use it, the same way wl_shell went. Having it only in the weston source tree, and in a private "dmabuf" namespace seems like it should be enough for now.
On Tue, Jan 7, 2014 at 12:41 PM, <benjamin.gaign...@linaro.org> wrote: > From: Benjamin Gaignard <benjamin.gaign...@linaro.org> > > The goal of this serie of patches is to add a way to use > dmabuf file descriptor inside wayland and weston. > > In a context where there is no Mesa EGL (and so no wl_drm protocol) > wl_dmabuf > could be used as an alternative to shm to share buffers between hardware > devices. If your hardware device (video decoder, renderer, etc...) need > physical contiguous memory (obviously don't have MMU) wl_dmabuf may save > the cost of one copy compare to shm. > > shm case: > videodecoder --(copy into shm_buffer)--> weston(+pixman) --> HW renderer > > dmabuf case: > videodecoder --(directly write in dmabuf buffer)--> weston(+pixman) --> HW > renderer > > The server is responsible to send its supported pixel formats and the > device > name to be used by the client to allocate buffers. > > While mmap() call on dmabuf file descriptor result isn't guaranty on all > architectures both server and client should take care of it before > accessing > to buffer data to avoid segfault. > > This series of patches include wayland and weston modifications. > An example of how use wl_dmabuf is provided in > weston/clients/simple-dmabuf.c > > === Wayland === > Benjamin Gaignard (1): > Add wl_dmabuf protocol > > protocol/Makefile.am | 6 +- > protocol/wayland-dmabuf.xml | 128 ++++++++++++++++++++++++ > src/Makefile.am | 12 ++- > src/wayland-dmabuf.c | 231 > +++++++++++++++++++++++++++++++++++++++++++ > src/wayland-dmabuf.h | 123 +++++++++++++++++++++++ > 5 files changed, 496 insertions(+), 4 deletions(-) > create mode 100644 protocol/wayland-dmabuf.xml > create mode 100644 src/wayland-dmabuf.c > create mode 100644 src/wayland-dmabuf.h > > === Weston === > Benjamin Gaignard (2): > compositor-drm: allow to be a wl_dmabuf server > add simple-dmabuf client > > clients/Makefile.am | 11 ++ > clients/simple-dmabuf.c | 469 > +++++++++++++++++++++++++++++++++++++++++++++++ > configure.ac | 5 + > src/compositor-drm.c | 83 ++++++++- > src/compositor.c | 4 +- > src/compositor.h | 2 + > src/pixman-renderer.c | 93 +++++++--- > 7 files changed, 637 insertions(+), 30 deletions(-) > create mode 100644 clients/simple-dmabuf.c > > -- > 1.7.9.5 > > _______________________________________________ > wayland-devel mailing list > wayland-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/wayland-devel > -- Jasper
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